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PID in Large Detector

PID in Large Detector. 2004.11.5 Y. Sugimoto. K- p separation by dE/dx of TPC. > 2 s separation 2< p<~30 GeV/c, p<0.9 GeV/c Gap in 0.9<p<2 GeV/c. s dE/dx =4.5%. K- p Separation ( s ). Momentum (GeV/c). Effect of TOF.

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PID in Large Detector

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  1. PID in Large Detector 2004.11.5 Y. Sugimoto

  2. K-p separation by dE/dx of TPC • > 2s separation 2< p<~30 GeV/c, p<0.9 GeV/c • Gap in 0.9<p<2 GeV/c sdE/dx=4.5% K-p Separation (s) Momentum (GeV/c)

  3. Effect of TOF • Large detector has long track path length (L>2m) and favorable for TOF • TOF counter with fine granularity is necessary to separate particles in a jet • Scintillator pads with SiPM readout (?) • Resistive plate counter: STAR TOF s~80ps

  4. Combined performance sTOF=100ps L=2.1m K-p Separation (s) Momentum (GeV/c)

  5. Summary • TOF counter with s<100ps combined with TPC of <4.5% dE/dx resolution gives seamless K-p separation > 2s below ~30GeV/c • What is the physics case? • D0/D0-bar identification by K+/K- ID • Improvement of jet energy resolution by assigning correct mass (???) • What else ? • What is the importance of filling the gap?

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